I couldn’t find any literature on how Galiteuthis uses those spikes. Presumably they are for catching and holding the squid’s unfortunate prey, such as zooplankton and small fishes. Personally, if I encounter Galiteuthis, I’ll endeavor to not piss it off. Cause DAMN, those are big, pointy tentacle-spikes!

Those spikes and suckers armed with teeth would have been a certain SFx hit in Pirates of the Caribeans!!! See how Hollywood could get real good at scaring out people with their monsters? By trying first the models tested and tried by evolution! ;)